What am I doing wrong? The anubias in my 55 gallon tank all have dark green algae on them. I have a low tech finnex stingray light in that tank (5-6hrs per day). I use API leaf zone once a week and API CO2 Booster daily. The plants are growing nicely, but just the anubias (and tank walls) are covered in this dark green algae. They are very difficult to get off the glass and equipment.